The mobilities of Na+, K+, Rb+, Cs+, Ca2+, Sr2+ and Ba2+ ions in nearly homo-ionic forms of Hector clinoptilolite were measured using radiochemical means. Self-diffusion coefficients at various temperatures were determined, enabling the calculation of energies, entropies and free energies of activation for cation migration (table 16) in the zeolite framework.
Studies on Natural Clinoptilolites - II: Cation Mobilities in Near Homoionic Clinoptilolites. A.Araya, A.Dyer: Journal of Inorganic and Nuclear Chemistry, 1981, 43[3], 595-8
Table 15
Diffusivity of o-Xylene and p-Xylene in H-CIT-1
Diffusant | Temperature (K) | D(cm2/s) |
o-xylene | 350 | 1.3 x 10-9 |
o-xylene | 375 | 1.1 x 10-9 |
o-xylene | 400 | 1.6 x 10-9 |
o-xylene | 425 | 1.0 x 10-9 |
p-xylene | 350 | 3.7 x 10-9 |
p-xylene | 400 | 6.9 x 10-9 |
p-xylene | 425 | 1.5 x 10-8 |